Technical Sciences Grade 12 P2 Eastern Cape Mock 2023 Memo

NATIONAL SENIOR CERTIFICATE/ NASIONALE SENIORSERTIFIKAAT GRADE/GRAAD 12 SEPTEMBER 2023 TECHNICAL SCIENCES P2 (CHEMISTRY) TEGNIESE WETENSKAPPE V2 (CHEMIE) MARKING GUIDELINE/NASIENRIGLYN MARKS/PUNTE: 75 This marking guideline consists of 7 pages./ Hierdie nasienriglyn bestaan uit 7 bladsye.

2 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION/VRAAG 1 1.1 C  (2) 1.2 D  (2) 1.3 B  (2) 1.4 B  (2) 1.5 A  (2) [10] QUESTION/VRAAG 2 2.1 An atom or a group of atoms that determines the chemistry of a molecule.  OR An atom or a group of atoms that determine(s) the physical and chemical properties of a group of organic compounds.  ʼn Atoom of ʼn groep atome wat die chemie van ʼn molekuul bepaal.  OF ʼn Atoom of ʼn groep atome wat die fisiese en chemiese eienskappe van ʼn groep organiese verbindings bepaal.  (2) 2.2 2.2.1 F (1) 2.2.2 Carboxyl group/Karboksielgroep  (1) 2.2.3 Aldehyde / Aldehied  (1) 2.2.4 (2-bromo-1,4-dichloro) ✓ butane / butaan  (2) 2.2.5 Polythene/Politeen  ACCEPT: Polyethene AANVAAR: Poliëteen (1) 2.2.6 2C6H14 + 19O2  12CO2 +14H2O Reactants  Products  Balancing  Reaktante  Produkte  Balansering  (3) Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 3 2.2.7 2-Methyl butan-1-ol  (2-methyl  1-butanol) / 2-metiel  butan-1-ol (2-metiel  1-butanol) (2) 2.2.8 CnH2nO2 ✓ (1) 2.3.1 The reddish-brown (bromine water) solution decolourises.  OR The reddish-brown colour disappears.  Die rooibruin (broomwater) oplossing verkleur.  OF Die rooibruin kleur verdwyn.  (1) 2.3.2 H H H H C C + Br Br H C C H H H Br Br Marking guidelines / Nasienriglyne  Alkene  Alkeen  Bromine (accept Br2)  Broom (Aanvaar Br2)  Functional group of product  Funksionele groep van produk  Whole structure of product  Hele struktuur van produk correct korrek (4) [19] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

4 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION/VRAAG 3 3.1 Structural isomers are organic molecules with the same molecular formula, but different structural formulae.  Strukturele isomere is organiese molekules met dieselfde molekules formule maar verskillende struktuurformules.  (2) 3.2 3.2.1 Higher than/Hoër as  (1) 3.2.2 Ethanoic acid/Etanoësuur  (1) 3.2.3 Esters  (1) 3.2.4 H O Ι ΙΙ H ─ C ─ O ─ C ─ H  Ι H Methyl methanoate/Metiel-metanoaat  (3) 3.2.5 Compound P has strong hydrogen bonds,  and compound Q has weak dipole-dipole Van der Waal forces.  More energy is needed to overcome the Intermolecular forces in compound P than in compound Q.  Verbinding P het sterk waterstofbindings  en verbinding Q het swak dipool-dipool Van der Waalskragte.  Meer energie is nodig om die intermolekulêre kragte in verbinding P te breek as in verbinding Q.  (3) [11] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 5 QUESTION/VRAAG 4 4.1 4.1.1 H2  (1) 4.1.2 HCℓ  (1) 4.2 4.2.1 Hydration (Addition)  Hidrasie (Addisie)  (1) 4.2.2 H O H H H C C C H H H H  (2) 4.3 C3H8 + 5O2 → 3CO2 + 4 H2O  (2) [7] QUESTION/VRAAG 5 5.1 A semiconductor is a material that has electrical conductivity between that of a conductor and an insulator.  ʼn Halfgeleier is ʼn stof wat die elektriese geleidingsvermoë tussen dié van ʼn geleier en ʼn isolator het.  (2) 5.2 5.2.1 Doping/Doktering  (1) 5.2.2 N-type/N-tipe  (1) 5.2.3 A semi-conductor material with excess negative charge carriers.  OR It is doped with a pentavalent element that introduces excess electrons.  ʼn Halfgeleier met ʼn oormaat negatiewe ladingdraers.  OF Dit word gedokteer met ʼn pentavalente element wat ʼn oormaat elektrone inbring.  (1) [5] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

6 TECHNICAL SCIENCES P2 (EC/SEPTEMBER 2023) QUESTION/VRAAG 6 6.1 The decomposition of a substance when an electric current is passed through it.  OR The chemical process in which electrical energy is converted to chemical energy.  OR The use of electrical energy to produce a chemical change.  Die ontbinding van ʼn stof waardeur ʼn elektriese stroom daardeur gevoer word.  OF Die chemiese proses waarin elektriese energie na chemiese energie omgeskakel word.  OF Die gebruik van elektriese energie om ʼn chemiese verandering te produseer.  (2) 6.2 Electrolytic cell: Converts electrical energy to chemical energy.  Elektrolitiese sel: Elektriese energie word na chemiese energie omgesit.  (1) 6.3 A (1) 6.4 6.4.1 Chlorine (gas) / Chloor(gas)  (1) 6.4.2 Cu2+ + 2e- → Cu  (2) 6.4.3 Cu2+ (ions)/Copper(II) (ions)/Cu2+ (ione)/Copper(II) (ione)  Cu2+ (ions) are reduced/gains electrons  Cu2+ (ione) word gereduseer/ontvang elektrone  (2) 6.4.4 Carbon/Graphite/Platinum  Koolstof/Grafiet/Platinum  (1) 6.5 DECREASES/NEEM AF  Cl- is oxidised to Cl2 and Cu2+ is reduced to Cu  OR Cl- changes to Cl2 and Cu2+ changes to Cu  Cl- word geöksideer na Cl2 en Cu2+ word na Cu gereduseer.  OF Cl- verander na Cl2 en Cu2+ verander na Cu  (2) [12] Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief

(EC/SEPTEMBER 2023) TECHNICAL SCIENCES P2 7 QUESTION/VRAAG 7 7.1 Galvanic cell/Galvaniese sel  (1) 7.2 There will be no reading OR The reading will be zero.  OR 0 V  Daar is geen lesing  OF Die lesing sal nul wees  OF 0 V  (2) 7.3 Temperature  and initial concentration  (of the electrolytes) Temperatuur  en aanvanklike konsentrasie  (van die elektroliete) (2) 7.4 7.4.1 The voltmeter’s terminals have been connected incorrectly.  OR Incorrect connection (+ to anode and – to cathode)  OR The reaction is non-spontaneous.  OR Cu will not reduce Al+3.  Die voltmeter se terminale is verkeerdelik gekoppel.  OF Verkeerde konneksies (+ aan anode en – aan katode)  OF Die reaksie is nie spontaan nie.  OF Cu sal nie Al+3 reduseer nie.  (2) 7.4.2 Aluminium is a stronger reducing agent than zinc  and zinc is a stronger reducing agent than copper  OR Zinc is a stronger oxidising agent than aluminum,  and copper is a stronger oxidising agent than zinc.  Aluminium is ʼn sterker reduseermiddel as sink,  en sink is ʼn sterker reduseermiddel as koper.  OF Sink is ʼn sterker oksideermiddel as aluminium  en koper is ʼn sterker oksideermiddel as sink.  (2) 7.5 7.5.1 Aluminium/Al  (1) 7.5.2 Zinc/(Sink)/Zn  (1) [11] TOTAL: 75 Copyright reserved/Kopiereg voorbehou Please turn over/Blaai om asseblief